And just why would Buffalo take this deal?

Because they can get a 2nd (and maybe +4th) for Smith and a 3rd (maybe +) for Dadonov with retension. I like this deal for both teams.

So you think Eichel is worth a 2nd, 2 3rds and Krebs? Maybe if those two thirds were firsts….

And Hague

buffalo gladly accepts

This is reasonable - if I knew I could flip Smith with retention for a late 1st value I'd do it immediately. A little risky for BUF with those conditions and only getting a 2nd for Smith

To me the biggest hurdle is Vegas including Krebs and Dadonovs no move clause, Buffalo would probably have to work in a three team deal so he goes to a team he finds acceptable)

From Buffalos side, if Eichel comes back healthy, there’s a very good chance Vegas makes the cup final, although they could always include the condition on a pick of a future year and make it upgrade if they make the cup final in either year.

But most likely you’d have:
Krebs
Hague
3rd (could easily become a 1st)
1st (if they retain half of Smith, which doesn’t hurt them at all, he should get them a 1st)
3rd (Dadonov could be traded for a later pick, or high pick if they retain something, Buffalo knows they can’t contend for the next few years so why wouldn’t they)

And Hague (as Chabotrrorr said) and yes but that’s worse case scenario too. You’re saying he’s worth that much if you get <20 games out of Eichel and that only happens if there are complications after the surgery and the recovery time is lengthened.

It also means he could be worth:
Krebs + Hague + 2 1sts + 3rd

That seems like a very acceptable return for Buffalo